linux-kernel - [PATCH] soc: qcom: ubwc: provide no-UBWC configuration

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Message-Id: <20250706-ubwc-no-ubwc-v1-1-e39552aa04df@oss.qualcomm.com>
Date: Sun, 06 Jul 2025 14:01:03 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Rob Clark <robin.clark@....qualcomm.com>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] soc: qcom: ubwc: provide no-UBWC configuration

After the commit 45a2974157d2 ("drm/msm: Use the central UBWC config
database") the MDSS driver errors out if UBWC database didn't provide it
with the UBWC configuration. Make UBWC database return zero data for
MSM8916 / APQ8016, MSM8974 / APQ8074, MSM8226 and MSM8939.

Fixes: 1924272b9ce1 ("soc: qcom: Add UBWC config provider")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Note: the driver is a part of drivers/soc, but as it got merged through
drm/msm tree, this fix should also go through the drm/msm tree.
---
 drivers/soc/qcom/ubwc_config.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/soc/qcom/ubwc_config.c b/drivers/soc/qcom/ubwc_config.c
index bd0a98aad9f3b222abcf0a7af85a318caffa9841..df074520a8cae1a202a14ca094903bb1e7389066 100644
--- a/drivers/soc/qcom/ubwc_config.c
+++ b/drivers/soc/qcom/ubwc_config.c
@@ -12,6 +12,10 @@
 
 #include <linux/soc/qcom/ubwc.h>
 
+static const struct qcom_ubwc_cfg_data no_ubwc_data = {
+	/* no UBWC, no HBB */
+};
+
 static const struct qcom_ubwc_cfg_data msm8937_data = {
 	.ubwc_enc_version = UBWC_1_0,
 	.ubwc_dec_version = UBWC_1_0,
@@ -215,11 +219,17 @@ static const struct qcom_ubwc_cfg_data x1e80100_data = {
 };
 
 static const struct of_device_id qcom_ubwc_configs[] __maybe_unused = {
+	{ .compatible = "qcom,apq8016", .data = &no_ubwc_data },
+	{ .compatible = "qcom,apq8074", .data = &no_ubwc_data },
 	{ .compatible = "qcom,apq8096", .data = &msm8998_data },
+	{ .compatible = "qcom,msm8226", .data = &no_ubwc_data },
+	{ .compatible = "qcom,msm8916", .data = &no_ubwc_data },
 	{ .compatible = "qcom,msm8917", .data = &msm8937_data },
 	{ .compatible = "qcom,msm8937", .data = &msm8937_data },
+	{ .compatible = "qcom,msm8939", .data = &no_ubwc_data },
 	{ .compatible = "qcom,msm8953", .data = &msm8937_data },
 	{ .compatible = "qcom,msm8956", .data = &msm8937_data },
+	{ .compatible = "qcom,msm8974", .data = &no_ubwc_data },
 	{ .compatible = "qcom,msm8976", .data = &msm8937_data },
 	{ .compatible = "qcom,msm8996", .data = &msm8998_data },
 	{ .compatible = "qcom,msm8998", .data = &msm8998_data },

---
base-commit: 8290d37ad2b087bbcfe65fa5bcaf260e184b250a
change-id: 20250706-ubwc-no-ubwc-3c5919273e03

Best regards,
-- 
With best wishes
Dmitry